test: fix check_workflow_timestamp_api tests for updated error messages

Tests asserted 'integrity check failed' but the error message was
changed to 'is outdated or unverifiable' in #24198. Updated all 6
assertions to match the current production error format.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: lpcox

actions/setup/js/check_workflow_timestamp_api.test.cjs

@@ -234,7 +234,7 @@ jobs:
       await main();
 
       expect(mockCore.warning).toHaveBeenCalledWith(expect.stringContaining("Could not compare frontmatter hashes"));
-      expect(mockCore.setFailed).toHaveBeenCalledWith(expect.stringContaining("integrity check failed"));
+      expect(mockCore.setFailed).toHaveBeenCalledWith(expect.stringContaining("is outdated"));
       expect(mockCore.summary.addRaw).toHaveBeenCalled();
       expect(mockCore.summary.write).toHaveBeenCalled();
     });
@@ -245,7 +245,7 @@ jobs:
       await main();
 
       expect(mockCore.warning).toHaveBeenCalledWith(expect.stringContaining("Could not compare frontmatter hashes"));
-      expect(mockCore.setFailed).toHaveBeenCalledWith(expect.stringContaining("integrity check failed"));
+      expect(mockCore.setFailed).toHaveBeenCalledWith(expect.stringContaining("is outdated"));
       expect(mockCore.summary.addRaw).toHaveBeenCalled();
       expect(mockCore.summary.write).toHaveBeenCalled();
     });
@@ -347,7 +347,7 @@ engine: claude
 
       expect(mockCore.info).toHaveBeenCalledWith(expect.stringContaining("Unable to fetch lock file content"));
       expect(mockCore.warning).toHaveBeenCalledWith(expect.stringContaining("Could not compare frontmatter hashes"));
-      expect(mockCore.setFailed).toHaveBeenCalledWith(expect.stringContaining("integrity check failed"));
+      expect(mockCore.setFailed).toHaveBeenCalledWith(expect.stringContaining("is outdated"));
     });
   });
 
@@ -699,7 +699,7 @@ engine: copilot
       expect(mockCore.info).toHaveBeenCalledWith(expect.stringContaining("Unable to fetch lock file content for hash comparison via API"));
       expect(mockCore.info).toHaveBeenCalledWith(expect.stringContaining("GITHUB_WORKSPACE not available"));
       expect(mockCore.warning).toHaveBeenCalledWith(expect.stringContaining("Could not compare frontmatter hashes"));
-      expect(mockCore.setFailed).toHaveBeenCalledWith(expect.stringContaining("integrity check failed"));
+      expect(mockCore.setFailed).toHaveBeenCalledWith(expect.stringContaining("is outdated"));
     });
 
     it("should fail when API fails and local lock file is missing", async () => {
@@ -711,7 +711,7 @@ engine: copilot
 
       expect(mockCore.info).toHaveBeenCalledWith(expect.stringContaining("Local lock file not found"));
       expect(mockCore.warning).toHaveBeenCalledWith(expect.stringContaining("Could not compare frontmatter hashes"));
-      expect(mockCore.setFailed).toHaveBeenCalledWith(expect.stringContaining("integrity check failed"));
+      expect(mockCore.setFailed).toHaveBeenCalledWith(expect.stringContaining("is outdated"));
     });
 
     it("should use API if available even in cross-repo scenario (API preferred over local files)", async () => {
@@ -784,7 +784,7 @@ engine: copilot
       // The path traversal is rejected before any file read
       expect(mockCore.info).toHaveBeenCalledWith(expect.stringContaining("escapes workspace"));
       expect(mockCore.warning).toHaveBeenCalledWith(expect.stringContaining("Could not compare frontmatter hashes"));
-      expect(mockCore.setFailed).toHaveBeenCalledWith(expect.stringContaining("integrity check failed"));
+      expect(mockCore.setFailed).toHaveBeenCalledWith(expect.stringContaining("is outdated"));
     });
   });
 });